A client was recently diagnosed with a heart murmur and is asking the nurse for more information. How should the nurse describe to the client about what a heart murmur is?

A heart murmur is a high-pitched sound caused by a narrowing of a heart valve

A heart murmur is an extra sound heard from blood entering a rigid heart chamber

A heart murmur is a sound generated by inflammation around the heart muscle

A heart murmur indicates turbulent blood flow through a valve in the heart